CN111056707A - Anaerobic ammonia oxidation autotrophic nitrogen removal system and method for municipal sewage - Google Patents
Anaerobic ammonia oxidation autotrophic nitrogen removal system and method for municipal sewage Download PDFInfo
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- CN111056707A CN111056707A CN201911343238.3A CN201911343238A CN111056707A CN 111056707 A CN111056707 A CN 111056707A CN 201911343238 A CN201911343238 A CN 201911343238A CN 111056707 A CN111056707 A CN 111056707A
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- 239000010865 sewage Substances 0.000 title claims abstract description 73
- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 28
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims description 131
- 230000003647 oxidation Effects 0.000 title claims description 68
- 238000007254 oxidation reaction Methods 0.000 title claims description 68
- 229910021529 ammonia Inorganic materials 0.000 title claims description 65
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims description 37
- 229910052757 nitrogen Inorganic materials 0.000 title claims description 18
- 230000005764 inhibitory process Effects 0.000 claims abstract description 62
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 29
- 238000004062 sedimentation Methods 0.000 claims description 98
- 239000010802 sludge Substances 0.000 claims description 82
- 238000006243 chemical reaction Methods 0.000 claims description 35
- 238000010992 reflux Methods 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000005273 aeration Methods 0.000 claims description 13
- 239000003814 drug Substances 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 241000191025 Rhodobacter Species 0.000 claims description 8
- 239000007791 liquid phase Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- 238000009825 accumulation Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 229910002651 NO3 Inorganic materials 0.000 claims description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- 239000000370 acceptor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention belongs to the technical field of biological sewage treatment, and particularly relates to a system and a method for urban sewage anammox autotrophic denitrification, and more particularly relates to a system and a method for realizing urban sewage anammox autotrophic denitrification based on molecular nitrite side inhibition. The system has the advantages of reasonable structural design, convenient operation and use, low operation and maintenance cost and relatively low energy consumption, does not need to additionally increase a carbon source, and can realize more stable short-cut nitrification of the municipal sewage.
Description
Technical Field
The invention belongs to the technical field of biological sewage treatment, and particularly relates to a system and a method for urban sewage anammox autotrophic denitrification, and more particularly relates to a system and a method for realizing urban sewage anammox autotrophic denitrification based on molecular nitrite side inhibition.
Background
At present, most inland rivers and lakes in China are polluted by nitrogen and phosphorus pollutants of different degrees, and the eutrophication phenomenon of water bodies is frequent. The traditional sewage denitrification technology has the defects of high energy consumption and low efficiency, and saves the development of a new economic and efficient sewage denitrification technology.
The anaerobic ammonia oxidation denitrification approach is discovered by dutch scientists in the eighties of the last century, and the biochemical reaction is based on red anaerobic ammonia oxidation bacteria (rhodobacter) and utilizes nitrite electron acceptors to directly oxidize ammonia nitrogen into nitrogen for denitrification without organic carbon sources. Compared with the traditional biological denitrification technology, the method can save the running energy consumption of a denitrification system by more than 50 percent, reduce the sludge yield by about 90 percent and reduce the greenhouse gas emission by more than 80 percent. The Total Nitrogen (TN) is removed through anaerobic ammonia oxidation, nitrite is required to be provided as an electron acceptor in a short-cut nitrification process, and therefore, the stable operation of short-cut nitrification in the short-cut nitrification-anaerobic ammonia oxidation process is the key of the process.
Based on the above, the invention provides a system and a method for realizing anaerobic ammonia oxidation autotrophic nitrogen removal based on side inhibition of molecular nitrite, which utilize an energy-saving and high-efficiency method to treat urban sewage,
disclosure of Invention
The invention aims to overcome the defects in the application of urban sewage shortcut nitrification-anaerobic ammonia oxidation in the prior art, and provides a system and a method for realizing urban sewage anaerobic ammonia oxidation autotrophic nitrogen removal based on molecular nitrite side inhibition.
In order to achieve the above objects, one aspect of the present invention provides an anammox autotrophic nitrogen removal system for municipal sewage, comprising:
the primary sedimentation system comprises a primary sedimentation tank and a sludge discharge pump, wherein the primary sedimentation tank is connected with a sewage inlet pipeline, the upper part of the primary sedimentation tank is provided with a water outlet weir, and the lower part of the primary sedimentation tank is provided with a sludge discharge port connected with the sludge discharge pump;
the A/O reaction tank comprises an A area and an O area which are connected in sequence; the water outlet weir is connected with the area A; an aeration disc is arranged at the bottom of the O area;
the air blower is connected with the aeration disc;
the inclined plate sedimentation system comprises a blow-off pipe, a sludge reflux pump and an inclined plate sedimentation tank, wherein an inclined plate, a perforated water distribution pipe and a sludge hopper are sequentially arranged in the inclined plate sedimentation tank from top to bottom; the O area is connected with the inclined plate sedimentation tank through the perforated water distribution pipe; the sludge hopper is sequentially connected with the sewage discharge pipe and the sludge reflux pump; the sludge reflux pump is respectively connected with the area A and the inhibition pool;
the inhibition system comprises an inhibition pool, a medicament barrel, an inhibition reflux pump and a dosing pump, wherein the medicament barrel is connected with the inhibition pool through the dosing pump, and the inhibition pool is connected with the area A through the inhibition reflux pump;
the anaerobic ammonia oxidation tank is connected with the inclined plate sedimentation tank, and a plurality of anaerobic ammonia oxidation fillers are arranged in the anaerobic ammonia oxidation tank;
the secondary sedimentation system comprises a secondary sedimentation tank, a sludge discharge pump and a secondary sedimentation tank reflux pump, wherein the secondary sedimentation tank is connected with an outlet of the anaerobic ammonia oxidation tank, the bottom of the secondary sedimentation tank is connected with an inlet of the anaerobic ammonia oxidation tank through the secondary sedimentation tank reflux pump, a sludge discharge pipeline is arranged at the lower part of the secondary sedimentation tank, and the sludge discharge pipeline is connected with the sludge discharge pump;
the stirring device is arranged in the area A, the inhibition pool and the bottom of the medicine adding barrel;
and the online pH detection system is used for detecting the pH value in the inhibition pool in real time.
In the invention, in order to better control the amount of sludge returning to the zone A and entering the inhibition tank in the inclined plate sedimentation tank, regulating valves are preferably arranged on pipelines of the sludge reflux pump, which are respectively connected with the zone A and the inhibition tank. In order to control the sludge age in the inhibition tank, the pipeline of the inhibition tank connected with the A area is preferably provided with a regulating valve. In order to adjust the water passing speed in the anaerobic ammonia oxidation tank and simultaneously control the discharge of the aged biomembrane and the suspended sludge in the secondary sedimentation tank, preferably, regulating valves are arranged on pipelines connecting the bottom of the secondary sedimentation tank and a return pump of the secondary sedimentation tank and on sludge discharge pipelines.
In order to better control sewage inlet, a water inlet valve is preferably arranged on the sewage inlet pipeline.
According to the invention, preferably, a plurality of baffle plates are arranged in the A/O tank in a staggered manner, the baffle plates divide the A area and the O area into a plurality of A tanks and a plurality of O tanks respectively, the bottom of each A tank is provided with a stirring device, and the bottom of each O tank is provided with an aeration disc.
According to the invention, preferably, the anaerobic ammonia oxidation tank is provided with a plurality of baffle plates in a staggered manner, the baffle plates divide the anaerobic ammonia oxidation tank into a plurality of rhodobacter ponds, and a plurality of anaerobic ammonia oxidation fillers are arranged in the rhodobacter ponds.
In the present invention, the baffle is preferably vertically fixed at one end to the top or bottom of the tank and at the other end to form a fluid passage with the bottom or top of the tank.
In another aspect, the present invention provides an anammox autotrophic denitrification method for municipal sewage, which is performed in the above system, and comprises:
1) starting short-cut nitrification: adding activated sludge with nitrification into an A/O reaction tank, an inclined plate sedimentation tank and an inhibition tank, simultaneously introducing urban sewage, starting a stirring device and an air blower, conveying the sewage into the A/O reaction tank after the sewage enters a primary sedimentation tank and is subjected to primary sedimentation, and flowing to the inclined plate sedimentation tank through a perforated water distribution pipe, wherein the sludge at the bottom of the inclined plate sedimentation tank is returned to the A/O reaction tank, and the rest part of the sludge is conveyed to the inhibition tank; mixing sludge and nitrite solution in an inhibition pool, starting an inhibition reflux pump when the pH value in the inhibition pool is 5.5-6.5, the concentration of the nitrite solution is 400-500 mg/L and the concentration of molecular nitrite FNA is 0.9-1.3 mg/L, and injecting the inhibition sludge into the A/O reaction pool;
2) starting anaerobic ammonia oxidation: when the accumulation rate of nitrite in the A/O reaction tank reaches more than 60%, sending the sewage in the inclined plate sedimentation tank to an anaerobic ammonia oxidation tank, sending the sewage in the anaerobic ammonia oxidation tank to a secondary sedimentation tank after biological denitrification is completed by anaerobic ammonia oxidation filler, sending liquid phase materials at the bottom of the secondary sedimentation tank back to the anaerobic ammonia oxidation tank, and discharging sludge out of the system; after NAR of the sewage in the A/O reaction tank reaches a target value, part of liquid-phase materials at the bottom of the secondary sedimentation tank is sent back to the anaerobic ammonia oxidation tank, and the rest is extracted;
wherein the nitrite accumulation rate is the concentration of nitrite in the effluent of the A/O reaction tank/(the concentration of nitrite in the influent + the concentration of nitrate).
In the invention, ammonia nitrogen in municipal sewage is oxidized into nitrite nitrogen in an A/O reaction tank, and preferably, in the step (1), the activated sludge with nitrification comes from an aeration tank of a municipal sewage plant; the activated sludge concentration MLSS in the A/O reaction tank, the inclined plate sedimentation tank and the inhibition tank is 3000-4000 mg/L.
In order to control the short-cut nitrification reaction process, preferably, in the step (1), the hydraulic retention time HRT in the A/O reaction tank is 6-8 h, and the DO in the O area is 1.5-2.5 mg/L; in the inhibition tank, the sludge age SRT is more than or equal to 3 d.
According to the invention, preferably, in the step (1), the target value is 3000-4000 mg/L;
in the anaerobic ammonia oxidation tank, nitrite nitrogen reacts with ammonia nitrogen in municipal sewage to generate nitrogen and a small amount of nitrate nitrogen. After the sewage is denitrified by the biological anaerobic ammonia oxidation filler in the anaerobic ammonia oxidation tank, the sewage is sent to a secondary sedimentation tank, liquid phase materials at the bottom of the secondary sedimentation tank are sent back to the anaerobic ammonia oxidation tank, the flow velocity of water passing in the anaerobic ammonia oxidation tank is increased, the hydraulic shearing force on the anaerobic ammonia oxidation filler is increased, and the growth of a biological film is facilitated. Meanwhile, aged biomembranes and suspended sludge from the anaerobic ammonia oxidation tank are pumped out of the system in time through a sludge discharge pump, and accumulation of sludge at the bottom of the secondary sedimentation tank is avoided. And after the discharge standard is met, returning part of the liquid-phase material at the bottom of the secondary sedimentation tank to the anaerobic ammonia oxidation tank, and extracting the rest part.
Compared with the prior art, the invention has the following advantages:
1) the invention adopts a continuous flow operation process, which is convenient to control; compared with the intermittent flow process, the continuous flow operation process is simpler in operation, easy to control and beneficial to process popularization and application.
2) Compared with the traditional nitration reaction, the anaerobic ammonia oxidation autotrophic denitrification system for urban sewage provided by the invention saves more aeration energy consumption; and compared with the whole nitrification process, the oxygen demand of the short-cut nitrification is reduced by 62.5 percent.
3) The anaerobic ammonium oxidation bacteria adopted by the invention are autotrophic microorganisms, and can carry out denitrification reaction without an external carbon source, so that compared with the traditional nitrification-denitrification treatment process, the anaerobic ammonium oxidation bacteria greatly save the medicine consumption.
4) According to the invention, the inclined plate sedimentation tank is arranged to separate the shortcut nitrification sludge in advance, so that the shortcut nitrification sludge is effectively prevented from being in direct contact with the anaerobic ammonia oxidation biomembrane, and the requirements of different denitrification microorganisms on dissolved oxygen are met.
5) The invention realizes short-cut nitrification by side molecular nitrite inhibition, and can maintain long-term stable operation of the short-cut nitrification of the system.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 shows a schematic diagram of an anammox autotrophic denitrification system for municipal sewage in an embodiment of the invention.
FIG. 2 shows the change in NAR in the A/O reaction tank after initiation of the short-cut nitrification in one embodiment of the present invention.
FIG. 3 shows the variation of the effluent quality of the A/O reaction tank and the anammox tank after stable operation in one embodiment of the present invention.
Description of reference numerals:
1. a water inlet valve; 2. a water inlet pump; 3. a primary sedimentation tank; 4. a stirrer-1; 5. an A/O reaction tank; 6. A blower; 7. an aeration disc; 8. a sludge reflux pump; 9. a sloping plate sedimentation tank; 10. perforating a water distribution pipe; 11. an anaerobic ammonia oxidation tank; 12. anaerobic ammonium oxidation filler; 13. a reflux pump of the secondary sedimentation tank; 14. a secondary sedimentation tank; 15. a sludge discharge pump; 16. a suppression pool; 17. inhibiting a sludge regulating valve; 18. a return sludge regulating valve; 19. a sludge discharge pump; 20. an online pH detection system; 21. inhibiting a reflux pump; 22. a stirrer-2; 23. a stirrer-3; 24. a medicament barrel; 25. a dosing pump.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.
Examples
An anammox autotrophic nitrogen removal system for municipal sewage as shown in figure 1, comprising:
the primary sedimentation system comprises a primary sedimentation tank 3 and a sludge discharge pump 19, wherein the primary sedimentation tank 3 is connected with a sewage inlet pipeline, the upper part of the primary sedimentation tank is provided with a water outlet weir, and the lower part of the primary sedimentation tank is provided with a sludge discharge port connected with the sludge discharge pump 19; a water inlet valve 1 and a water inlet pump 2 are arranged on the sewage inlet pipeline;
the A/O reaction tank 5 comprises an A area, an O area and a plurality of baffle plates which are arranged in a staggered mode, wherein the A area, the O area and the baffle plates are connected in sequence, one end of each baffle plate is vertically fixed to the top or the bottom of the water tank, the other end of each baffle plate and the bottom or the top of the water tank form a fluid channel, the baffle plates divide the A area and the O area into a plurality of A tanks and a plurality of O tanks, each A tank is internally provided with a stirrer-14, each O tank is internally provided with an aeration disc 7, and the aeration discs 7 are connected with an air; the effluent weir is connected with the first pool A;
the inclined plate sedimentation system comprises a blow-off pipe, a sludge reflux pump 8 and an inclined plate sedimentation tank 9, wherein an inclined plate, a perforated water distribution pipe 10 and a sludge hopper are sequentially arranged in the inclined plate sedimentation tank 9 from top to bottom;
the last O tank is connected with an inclined plate sedimentation tank 9 through a perforated water distribution pipe 10;
the sludge hopper is sequentially connected with a blow-off pipe and a sludge reflux pump 8; the sludge reflux pump 8 is respectively connected with the first A pool and the inhibition pool 16, and a reflux sludge regulating valve 18 and an inhibition sludge regulating valve 17 are arranged on a pipeline of the sludge reflux pump 8 respectively connected with the first A pool and the inhibition pool 16;
the inhibition system comprises an inhibition pool 16, a medicament barrel 24, a stirrer-222, a stirrer-323, an inhibition reflux pump 21 and a dosing pump 25, wherein the medicament barrel 24 is connected with the inhibition pool 16 through the dosing pump 25, and the inhibition pool 16 is connected with a first pool A through the inhibition reflux pump 21; a regulating valve is arranged on a pipeline connecting the inhibition pool 16 and the first pool A, a stirrer-222 is arranged at the bottom of the inhibition pool 16, and a stirrer-323 is arranged at the bottom of the medicament barrel 24;
the anaerobic ammonia oxidation tank 11 is internally provided with a plurality of baffle plates in a staggered manner, one end of each baffle plate is vertically fixed at the top or the bottom of the tank, the other end of each baffle plate and the bottom or the top of the tank form a fluid channel, the anaerobic ammonia oxidation tank 11 is divided into a plurality of rhodobacter ponds by the baffle plates, and a plurality of biological anaerobic ammonia oxidation fillers are arranged in the rhodobacter ponds; the first rhodobacter xylinum pond is connected with the inclined plate sedimentation tank 9,
the secondary sedimentation system comprises a secondary sedimentation tank 14 and a secondary sedimentation tank reflux pump 13, wherein the secondary sedimentation tank 14 is connected with an outlet of the anaerobic ammonia oxidation tank 11, the bottom of the secondary sedimentation tank 14 is connected with an inlet of the anaerobic ammonia oxidation tank 11 through the secondary sedimentation tank reflux pump 13, the lower part of the secondary sedimentation tank reflux pump is provided with a sludge discharge pipeline, and a sludge discharge pump 15 is arranged on the sludge discharge pipeline; and the sludge discharge pipelines on the pipelines connected with the return pump 13 of the secondary sedimentation tank at the bottom of the secondary sedimentation tank 14 are provided with regulating valves.
And the online pH detection system 20 is used for detecting the pH value in the inhibition pool 16 in real time.
Carry out urban sewage treatment in above-mentioned urban sewage anammox autotrophic denitrogenation system, include:
1) starting short-cut nitrification: activated sludge with nitrification function from an aeration tank of a municipal sewage plant is added into an A/O reaction tank 5, an inclined plate sedimentation tank 9 and a suppression tank 16, and activated sludge is inoculated to keep the activated sludge concentration MLSS at 3000-4000 mg/L; simultaneously, introducing urban sewage, starting a stirring device and an air blower 6, conveying the sewage after the sewage enters a primary sedimentation tank 3 and is subjected to primary sedimentation to an A/O reaction tank 5, wherein the hydraulic retention time HRT in the A/O reaction tank 5 is 6-8 h, and the DO in an O area is 1.5-2.5 mg/L. The sewage flows to an inclined plate sedimentation tank 9 through a perforated water distribution pipe 10, the sludge part at the bottom of the inclined plate sedimentation tank 9 is returned to an A/O reaction tank 5, and the rest part is sent to a suppression tank 16; continuously adding nitrite solution into the inhibition pool, starting the inhibition reflux pump 21 when the pH value in the inhibition pool is 5.5-6.5, the concentration of the nitrite solution is 400-500 mg/L and the concentration of molecular nitrite FNA is 0.9-1.3 mg/L, pumping a mixed material of sludge and the nitrite solution into the first A pool, and controlling the sludge age SRT in the inhibition pool 16 to be 3d through the inhibition reflux pump 21 and the regulating valve;
2) starting anaerobic ammonia oxidation: when the cumulative rate of nitrite in the A/O reaction tank 5 reaches more than 60%, the sewage in the inclined plate sedimentation tank 9 is sent to an anaerobic ammonia oxidation tank 11, the sewage in the anaerobic ammonia oxidation tank 11 is sent to a secondary sedimentation tank 14 after biological denitrification is completed by anaerobic ammonia oxidation fillers 12, a liquid phase material part at the bottom of the secondary sedimentation tank 14 is sent back to the anaerobic ammonia oxidation tank 11, and sludge is discharged out of the system; when NAR in the A/O reaction tank 5 reaches more than 60%, the liquid phase material at the bottom of the secondary sedimentation tank is partially sent back to the anaerobic ammonia oxidation tank, and the rest is extracted;
wherein the nitrite accumulation rate is the concentration of nitrite in the effluent of the A/O reaction tank/(the concentration of nitrite in the influent + the concentration of nitrate).
In the above embodiment, the city sewage quality is: COD is 106.1-182.4mg/L, NH4 +-N is 40.24 to 64.97mg/L, NO2 -N is 0.00 to 1.12mg/L, NO3 -N is 0.11-1.19 mg/L; TP is 3.13-8.31 mg/L; the pH value is 7.02-7.58.
When the urban sewage anammox autotrophic nitrogen removal system shown in fig. 1 is used for carrying out a sewage treatment process, the NAR of the AO pool changes as shown in fig. 2 in the process of starting the shortcut nitrification, and after 58 days, the NAR in the sewage reaches over 60 percent, and the shortcut nitrification is successfully started. And at the moment, partially returning the sewage in the secondary sedimentation tank to the anaerobic ammonia oxidation tank, discharging the rest part, and detecting the effluent quality of the A/O reaction tank and the anaerobic ammonia oxidation tank in the discharging process, wherein the detection structure is shown in figure 3, the ammonia nitrogen in the effluent is about 5mg/L, the effluent TN is about 12mg/L, and the effluent TN completely meets the sewage treatment standard.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The utility model provides a municipal sewage anaerobic ammonia oxidation autotrophic denitrogenation system which characterized in that, this municipal sewage anaerobic ammonia oxidation autotrophic denitrogenation system includes:
the primary sedimentation system comprises a primary sedimentation tank and a sludge discharge pump, wherein the primary sedimentation tank is connected with a sewage inlet pipeline, the upper part of the primary sedimentation tank is provided with a water outlet weir, and the lower part of the primary sedimentation tank is provided with a sludge discharge port connected with the sludge discharge pump;
the A/O reaction tank comprises an A area and an O area which are connected in sequence; the water outlet weir is connected with the area A; an aeration disc is arranged at the bottom of the O area;
the air blower is connected with the aeration disc;
the inclined plate sedimentation system comprises a blow-off pipe, a sludge reflux pump and an inclined plate sedimentation tank, wherein an inclined plate, a perforated water distribution pipe and a sludge hopper are sequentially arranged in the inclined plate sedimentation tank from top to bottom;
the O area is connected with the inclined plate sedimentation tank through the perforated water distribution pipe;
the sludge hopper is sequentially connected with the sewage discharge pipe and the sludge reflux pump; the sludge reflux pump is respectively connected with the area A and the inhibition pool;
the inhibition system comprises an inhibition pool, a medicament barrel, an inhibition reflux pump and a dosing pump, wherein the medicament barrel is connected with the inhibition pool through the dosing pump, and the inhibition pool is connected with the area A through the inhibition reflux pump;
the anaerobic ammonia oxidation tank is connected with the inclined plate sedimentation tank, and a plurality of biological anaerobic ammonia oxidation fillers are arranged in the anaerobic ammonia oxidation tank;
the secondary sedimentation system comprises a secondary sedimentation tank, a sludge discharge pump and a secondary sedimentation tank reflux pump, wherein the secondary sedimentation tank is connected with an outlet of the anaerobic ammonia oxidation tank, the bottom of the secondary sedimentation tank is connected with an inlet of the anaerobic ammonia oxidation tank through the secondary sedimentation tank reflux pump, a sludge discharge pipeline is arranged at the lower part of the secondary sedimentation tank, and the sludge discharge pipeline is connected with the sludge discharge pump;
the stirring device is arranged in the area A, the inhibition pool and the bottom of the medicine adding barrel;
and the online pH detection system is used for detecting the pH value in the inhibition pool in real time.
2. The municipal sewage anammox autotrophic nitrogen removal system according to claim 1, wherein the sludge reflux pump is respectively connected to the pipeline connecting the area A and the inhibition tank, and the pipeline connecting the inhibition tank and the area A, the pipeline connecting the bottom of the secondary sedimentation tank and the reflux pump of the secondary sedimentation tank, and the sludge discharge pipeline are provided with regulating valves; and a water inlet valve is arranged on the sewage inlet pipeline.
3. The municipal sewage anammox autotrophic nitrogen removal system according to claim 1, wherein,
a plurality of baffle plates are arranged in the A/O tank in a staggered mode, the baffle plates divide the A area and the O area into a plurality of A tanks and a plurality of O tanks respectively, a stirring device is arranged at the bottom of each A tank, and an aeration disc is arranged at the bottom of each O tank.
4. The municipal sewage anammox autotrophic nitrogen removal system according to claim 1, wherein,
the anaerobic ammonia oxidation tank is internally provided with a plurality of baffle plates in a staggered manner, the anaerobic ammonia oxidation tank is divided into a plurality of rhodobacter tanks by the baffle plates, and a plurality of biological anaerobic ammonia oxidation fillers are arranged in the rhodobacter tanks.
5. The municipal sewage anammox autotrophic nitrogen removal system according to claim 3 or 4, wherein the baffle is vertically fixed at one end to the top or bottom of the tank and at the other end forms a fluid channel with the bottom or top of the tank.
6. An anammox autotrophic anammox denitrification method for municipal sewage, which is carried out in the anammox autotrophic anammox denitrification system for municipal sewage according to any one of claims 1 to 5, comprising:
1) starting short-cut nitrification: adding activated sludge with nitrification into an A/O reaction tank, an inclined plate sedimentation tank and an inhibition tank, simultaneously introducing urban sewage, starting a stirring device and an air blower, conveying the sewage into the A/O reaction tank after the sewage enters a primary sedimentation tank and is subjected to primary sedimentation, and flowing to the inclined plate sedimentation tank through a perforated water distribution pipe, wherein the sludge at the bottom of the inclined plate sedimentation tank is returned to the A/O reaction tank, and the rest part of the sludge is conveyed to the inhibition tank; mixing sludge and nitrite solution in an inhibition pool, starting an inhibition reflux pump when the pH value in the inhibition pool is 5.5-6.5, the concentration of the nitrite solution is 400-500 mg/L and the concentration of molecular nitrite FNA is 0.9-1.3 mg/L, and injecting the inhibition sludge into the A/O reaction pool;
2) starting anaerobic ammonia oxidation: when the accumulation rate of nitrite in the A/O reaction tank reaches more than 60%, sending the sewage in the inclined plate sedimentation tank to an anaerobic ammonia oxidation tank, sending the sewage in the anaerobic ammonia oxidation tank to a secondary sedimentation tank after biological denitrification is completed by anaerobic ammonia oxidation filler, sending liquid phase materials at the bottom of the secondary sedimentation tank back to the anaerobic ammonia oxidation tank, and discharging sludge out of the system; after NAR of the sewage in the A/O reaction tank reaches a target value, part of liquid-phase materials at the bottom of the secondary sedimentation tank is sent back to the anaerobic ammonia oxidation tank, and the rest is extracted;
wherein the nitrite accumulation rate is the concentration of nitrite in the effluent of the A/O reaction tank/(the concentration of nitrite in the influent + the concentration of nitrate).
7. The method for anammox autotrophic nitrogen removal in municipal sewage according to claim 6, wherein in step (1), the activated sludge having nitrification activity is obtained from an aeration tank of a municipal sewage plant.
8. The method for anaerobic ammonia oxidation autotrophic nitrogen removal of municipal sewage according to claim 6, wherein in step (1), the activated sludge concentration MLSS in the A/O reaction tank, the inclined plate sedimentation tank and the inhibition tank is 3000-4000 mg/L.
9. The municipal sewage anammox autotrophic nitrogen removal method according to claim 6, wherein in the step (1), the hydraulic retention time HRT in the A/O reaction tank is 6-8 h, and the dissolved oxygen DO in the O zone is 1.5-2.5 mg/L; in the inhibition tank, the sludge age SRT is more than or equal to 3 d.
10. The method for anammox autotrophic nitrogen removal of municipal sewage according to claim 6, wherein in step (1), the target value is 3000-4000 mg/L.
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